NTE1489
Integrated Circuit
Stereo Demodulator
Description:
The NTE1489 is a silicon monolithic integrated circuit in a 16Lead DIP type package designd for use
as an FM multiplex demodulator for high class stere FM tuners. As the IC adopts a PLL (Phase Lock
Loop) system, complexity of contol is usually experienced when using conventional external coil is
eliminated and the demodulator can easily be constructed by simply controlling the external semi
fixed potentiometer. Internal circuits are composed of a stereo demodulator, a lamp driver, an input
stage preamplifier that is capable of establishing variable input signal levels, a VCO (Voltage Con-
trolled Oscillator) constituting PLL, a phase comparator, a LPF (Low Pass Filter), a frequency divider,
and a DC amplifier. A stereomonaural automatic switching circuit, a circuit for manual switching,
VCO forced stop circuit, etc. are builtin.
Features:
D
Fewer External Components. Coil is not used.
D
Low Monaural Total Harmonic Distortion
D
Low Stereo Total Harmonic Distortion
D
High Channel Separation
D
BuiltIn Output Stage Post Amplifier
D
StereoMonaural Switching can be made either Automatically or Manually from Outside. The
Shock Noise at Switching is Reduced Considerably.
D
StereoMonaural Switching Operation is perfectly Synchronized with the Stereo Indicator Lamp
D
Monitoring of VCO Free Running Frequency can be Performed by Directly Connecting the Fre-
quency Counter to Pin9.
D
High SignaltoNoise Ratio
D
Wide Maximum Input Level
Absolute Maximum Ratings: (T
A
= +25
C unless otherwise specified)
Supply Voltage, V
CC
15V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lamp Current, I
L
75mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package Dissipation (T
A
= +70
C), P
D
400mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, T
opr
20
to +70
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
40
to +125
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Operating Conditions: (T
A
= +25
C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Supply Voltage
V
CC
9
12
15
V
Electrical Characteristics: (T
A
= +25
C, V
CC
= 12V, f = 1kHz, R
1
= 47k
, R+L = 270mV,
Pilot = 30mV unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Supply Current
I
CC
No Signal
12
20
30
mA
Channel Separation
Sep.
Pilot = 30mV
f = 100Hz
40
50
dB
f = 1kHz
45
55
dB
f = 10kHz
35
45
dB
Voltage Gain
A
V
Monaural, V
in
= 300mV, Note 1
9
13
17
dB
Channel Balance
CB
Monaural, V
in
= 300mV
1.5
0
1.5
dB
Stereo, Pilot = 30mV
1.5
0
1.5
dB
Monaural Total Harmonic Distortion
THD
V
in
= 300mV
0.02
0.1
%
Stereo Total Harmonic Distortion
THD
R+L = 270mV,
f = 100Hz
0.02
%
Pilot = 30mV
f = 1kHz
0.02
0.1
%
f = 10kHz
0.12
%
Pilot Level for Lamp ON
L ON
Pilot Level, R
1
= 47k
6
12
20
mV
rms
Stereo Lamp Hysteresis
Hy.
Pilot Level
6
dB
Capture Range
CR
Pilot = 30mV
1.5
3.0
%
Ultrasonic Frequency Rejection
19kHz Rej.
Pilot = 30mV
35
dB
38kHz Rej.
Pilot = 30mV
45
dB
SCA Rejection
SCA Rej.
Pilot = 30mV, SCA = 30mV
70
dB
Maximum Input Level
V
in
Monaural, THD = 1%
0.7
V
rms
SignaltoNoise Ratio
S/N
V
in
= 300mV, After LPF
82
dB
StereoMonaural Switching
SWON Voltage
V
s
Pin16 Voltage where Stereo
Lamp OFF
1.4
1.6
V
VCO Stop Voltage
V
o
Pin16 Voltage where VCO Stops
7
V
CC
V
Note 1. A
V
is from the output level measured at the IC output terminal. A
V
can be set by the input
impedance R
1
.
Pin Connection Diagram
V
CC
Switch Filter
Lt Ch Output
Stereo Lamp & 19kHz Monitor
Loop Filter
GND
Preamp Output
Rt Ch Output
Postamp Bias
Switch Filter
Detector Input
Loop Filter
Stereo/Mono Switch & VCO Stop
Postamp Bias
Preamp Input
1
2
3
4
5
6
7
8
16
15
14
13
OSC RC Network
12
11
10
9
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